After fiddling with both the upscaled Voyagers, I didn't find Predaking to be too bad. Considering that the first Voyager wasn't that complex to begin with, I thought the simplicity was okay. The sculpting was detailed enough to make him look good in both modes and he retains all the standard articulation that you would expect. I just find the overuse of transparent plastic to be odd. Also, while they are huge, everything is hollow so it isn't as impressive on hand.
Optimus on the other hand is horrible. Once again, he is really hollow but the thing that ruins him is that so many parts are in neon/puke green. The shoulder articulation is restricted. The worst thing is that the simple sculpting makes Optimus seem like one of those oversized knock offs.
"sometimes the things you see might not be real and the things that are real you might not see"